Honeywell Gas boiler control unit S4570AS1012U

The S4570AS1012U is a Honeywell control box for gas burner and boiler systems. It runs on 220–240 V AC and is designed to work with the Honeywell VK41 series gas regulators. A connector on top of the unit enables plug-in installation onto the regulator. The unit has integrated protection functions and is available in different modifications to match various ignition arrangements. It does not act directly on the flame.

Control units of this type are selected by supply voltage and compatibility with the gas regulator series. They are installed directly onto the regulator via the top connector, which must match the regulator's mating connector. The unit can be rotated within a 90° angle in any direction from the vertical position of the two-position electric actuator, so mounting must respect that limit. Match the specific modification (e.g., for spark ignition or pilot burner ignition) to the boiler's ignition system before ordering.